/* ═══════════════════════════════════════════════
   base.css - 全站共享样式
   ═══════════════════════════════════════════════ */

/* ── CSS Variables (主题色) ── */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --primary-bg: #eef4ff;
    --accent: #f97316;
    --accent-dark: #ef4444;

    --text-dark: #0f172a;
    --text-body: #334155;
    --text-muted: #64748b;
    --text-light: #94a3b8;

    --bg-white: #ffffff;
    --bg-light: #f8fafc;
    --bg-gray: #f1f5f9;

    --border: #e2e8f0;
    --border-light: #f1f5f9;

    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.1);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;

    --max-width: 1200px;
}

/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
    color: var(--text-body);
    background: var(--bg-light);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--primary-dark); }

img { max-width: 100%; height: auto; display: block; }

/* ── Container ── */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* ── Buttons ── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 26px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 15px;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.25s ease;
    text-decoration: none;
    line-height: 1.4;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
    box-shadow: 0 4px 14px rgba(37,99,235,0.3);
}
.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37,99,235,0.4);
    color: #fff;
}

.btn-outline {
    background: transparent;
    border-color: var(--border);
    color: var(--text-muted);
}
.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-bg);
}

.btn-sm { padding: 10px 20px; font-size: 13px; border-radius: var(--radius-sm); }

/* ── Hero Section ── */
.hero-section {
    position: relative;
    padding: 70px 20px;
    text-align: center;
    overflow: hidden;
    color: #fff;
}
.hero-section h1 {
    font-size: 38px;
    font-weight: 800;
    margin-bottom: 12px;
    position: relative;
    z-index: 1;
}
.hero-section p {
    font-size: 16px;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

/* ── Cards ── */
.card {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all 0.3s ease;
}
.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

/* ── Pagination ── */
.pagination {
    display: flex;
    justify-content: center;
    gap: 6px;
    padding: 40px 0;
    flex-wrap: wrap;
}
.page-link {
    padding: 8px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-body);
    text-decoration: none;
    font-size: 14px;
    transition: all 0.2s;
}
.page-link:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-bg);
}
.page-link.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}
.page-link.disabled {
    color: #ccc;
    cursor: not-allowed;
}

/* ── No Results ── */
.no-results {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-light);
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    border: 1px dashed var(--border);
}

/* ── Fade-in animation ── */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ── Rich Text (article body) ── */
.rich-text {
    line-height: 1.85;
    color: var(--text-body);
    font-size: 15px;
}
.rich-text h2 { font-size: 22px; color: var(--text-dark); margin: 28px 0 14px; font-weight: 700; }
.rich-text h3 { font-size: 18px; color: var(--text-dark); margin: 24px 0 10px; font-weight: 600; }
.rich-text p { margin: 8px 0; }
.rich-text ul, .rich-text ol { margin: 10px 0; padding-left: 24px; }
.rich-text li { margin: 4px 0; }
.rich-text strong { color: var(--text-dark); }
.rich-text hr { border: none; border-top: 1px solid var(--border); margin: 28px 0; }
.rich-text table { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 14px; border-radius: var(--radius-md); overflow: hidden; box-shadow: var(--shadow-sm); }
.rich-text thead th { background: #1e40af; color: #fff; padding: 12px 16px; text-align: left; font-weight: 600; }
.rich-text tbody td { padding: 11px 16px; border-bottom: 1px solid var(--border-light); }
.rich-text tbody tr:nth-child(even) td { background: var(--bg-light); }
.rich-text tbody tr:hover td { background: var(--primary-bg); }

/* ── Filters ── */
.filter-bar {
    background: var(--bg-light);
    padding: 12px 16px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
}
.filter-select, .filter-input {
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 13px;
    background: var(--bg-white);
    outline: none;
    transition: border-color 0.2s;
}
.filter-select:focus, .filter-input:focus { border-color: var(--primary); }
.filter-submit {
    padding: 8px 16px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
}

/* ── Section heading pattern ── */
.section-heading {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* ── Responsive ── */
@media (max-width: 768px) {
    .hero-section h1 { font-size: 26px; }
    .hero-section { padding: 50px 20px; }
    .container { padding: 0 14px; }
    .rich-text table { font-size: 12px; }
    .rich-text thead th, .rich-text tbody td { padding: 8px 10px; }
}